bindUntilEvent 是来自哪里的?

[ZER01D]

// Rx写法
ModbusManager.get()
.rxReadHoldingRegisters(mSalveId, mOffset, mAmount)
.observeOn(AndroidSchedulers.mainThread())
.compose(this.bindUntilEvent(ActivityEvent.DESTROY))
.subscribe(new ModbusObserver() {
@OverRide
public void onSuccess(
ReadHoldingRegistersResponse readHoldingRegistersResponse) {
byte[] data = readHoldingRegistersResponse.getData();
mTvConsole.append("F03读取：" + ByteUtil.bytes2HexStr(data) + "\n");
}

    @Override
    public void onFailure(Throwable tr) {
        appendError("F03", tr);
    }
});

error: cannot find symbol
.compose(this.bindUntilEvent(ActivityEvent.DESTROY))
^
symbol: method bindUntilEvent(ActivityEvent)